Quote Originally Posted by andrewM View Post
No, I am not doing anything at the rear sight end but only the foresight end.

The problem is that the pivot lug will not budge it, despite the leverage of the barrel and if I place any further pressure on it, I might damage the barrel.

I have now introduced some WD40 to try to free it up and will give it another go in a few minutes.

Probably, it has jammed over the 40 odd years.

This all explains the confusion: I rather presumed I was on the right course but it would not budge.

Rgds
A
DON'T USE THE BARREL TO UNDO THE GUIDE! You will bend the barrel if the plug is tight. On the one I did (Mk2 really rough), I cut a thick piece of steel and held it in a vice and then turned the pistol. As has already been mentioned, a bit of heat helps. It might also help to try to tighten the guide a fraction first to break and bond. I have found that a couple of guns ( Premier M2 and the Junior Mk2) have been swines to undo, even though there did not seem to be lacquer sticking.